Now we all know Sony refuses to report sales numbers, instead opting for "Shipped" numbers. Even so, PSP shipments to the US were only 100,000 over 3 months leading up to Christmas! And this was with games like Metal Gear Solid coming out on the PSP. Now one could argue that the launch of the Wii and the PS3 overshadowed the PSP (well, maybe just the Wii
), but that wouldn't account for the DS's explosive sales which to this day still sell at every increasing rates.
PSP. Stick a fork in it, its done.